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"wha Wha" sound from engine at WOT?

I have a 06 A6 Corvette and under WOT, I hear almost a "Whirling" sound very hard to describe.

Anyone elese heard of this problem? Is this normal? Before I bought the car I did a Service History on it and the R&R Replace is on there so I take they have already changed the fluid in the rear. The Car has 10,600 miles.

Here is a small clip with my phone. Turn your speakers up, the sound is at the end of the WOT. Its a Wha Wha sound